Coiled laminated air brake tubing
AssigneeSaint-Gobain Performance Plastics Corporation
InventorsEdward A. Green, Dominic Profio, William Cramer
Life of this patent
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Abstract
An improved coiled air brake tubing is formed from a nylon polyurethane laminate. The laminate includes an innermost nylon layer surrounded with a thick intermediate polyurethane layer in turn covered with an outermost thin nylon layer. The polyurethane layer is fiber reinforced. The product is extruded and coiled around a heated mandril causing it to assume a coiled set. This exhibits improved low temperature properties and is less expensive than a nylon product.
Claims11
A coiled air brake tubing comprising a laminated tube said tube having an innermost layer of nylon, an intermediate layer of a polyurethane and an outermost layer of nylon wherein said tubing is set in a coiled configuration.
The method of forming a coiled laminated air brake tubing comprising co-extruding an innermost nylon layer and a first polyurethane layer;
- forming a fiber reinforcing layer over said first polyurethane layer;
- applying a solvent to said first polyurethane layer;
- extruding a second polyurethane layer over said fiber reinforcing layer and said first polyurethane layer;
- and
- extruding an outermost nylon layer over said second polyurethane layer.
Dependencies are inferred from the claim text.